I notice my 2001 XK8 top flutters a lot in the wind when down. This seems like it would put a lot of strain/stress on the top's interior lining, especially at highway speeds. I bought the vehicle used so I don't know if it normally comes with some kind of boot cover (I think that is what they are called). Other convertibles I have owned have stored the top within a hard plastic lid when down, so I just want to check whether it is necessary to buy a cover to protect the top when driving. Thanks.